<ul id="test">
    <li
        v-repeat="items"
        v-on="click:n++"
        class="item-{{$index}}"
    >
        {{n}}
    </li>
</ul>

<script src="../../../dist/vue.js"></script>
<script>
    var app = new Vue({
        el: '#test',
        data: {
            items: [
                { n: 1 },
                { n: 2 },
                { n: 3 }
            ]
        }
    })
</script>